Antibacterial Properties of Selected Green Seaweeds from Vedalai Coastal Waters; Gulf of Mannar Marine Biosphere Reserve

Abstract

Some commonly occurring green algae Codium adherens, Ulva reticulata and Halimeda tuna have been collected from the coast of Vedalai, Gulf of Mannar, Tamilnadu and were evaluated for antibacterial activity by agar diffusion method. Seven different solvents namely Acetone, Methanol, Chloroform, Diethyl ether, Ethyl acetate, Ethanol and Petroleum ether were used for extraction. The zone of inhibition were compared. The ethanol extract shows the better result for the other extracts. Some extracts found more effective than the commercial medicine. The maximum antibacterial activity was noted in ethanol extracts showed activity against Staphylococcus sp. (13 mm) and the minimum was recorded in methanol extracts against Escherichia coli, Staphylococcus sp. and proteus sp. (2 mm), Streptococcus sp. (2 mm), Enterococci sp. (3mm).